2024/10/02 by Hiragami, Shinichi, Onari, Seiichiro · 1 citation
#FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con)
paper · doi:10.48550/arxiv.2410.01412
Recently discovered superconducting infinite-layer nickelates RNiO2 (R=Nd, La, Pr) attract increasing attention due to their similarities to cuprates. Both RNiO2 and YBCO cuprates exhibit the non-Fermi-liquid transport behavior, characterized by resistivity proportional to temperature near the quantum critical point of the charge or spin density wave. In this study, we analyze the resistivity of infinite-layer nickelate Nd0.85Sr0.15NiO2 based on a three-dimensional tight-binding model within the framework of the quasi-particle picture by applying linear response theory. We take account of the self-energy by the fluctuation-exchange approximation for the Ni orbital and the T-matrix approximation for an impurity effect on the Nd orbitals. We find that (i) the T-linear resistivity at low temperatures is derived from the spin fluctuations, and (ii) a negative and T-linear Seebeck coefficient is obtained. Therefore, NdNiO2 behaves as a quasi-two-dimensional electron system, similar to CeCoIn5.